A friend close to the couple tells RadarOnline.com that they regularly come close to breaking up. “They can both be very jealous,” the friend says. “Selena can be so dramatic about Justin’s exes, who aren’t even in her league! They both engage in really petty arguments and it’s killing their relationship”

The source says that, though they always come close to splitting, Justin can’t find it within himself to let her go. “They ‘almost’ break up regularly,” the friend says. “But it’s a case of first love for Justin so he can’t even imagine being without her.”

HollywoodLife.com has reached out to reps for both Justin and Selena for comment. We haven’t heard back.

Do you believe that Justin and Selena are on the rocks, HollywoodLifers?